Uploaded February 2024 | Updated September 2026, 1 hour ago

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I opened up a very old chip. I tried to look up some information about it, but I got mixed information already after opening the chip and inspecting its silicon die.

First of all, the metal cap says MC2257, whereas the silicon die says MC2260. I think I believe the silicon die more. But interestingly, the MC2257 and MC2260 are siblings.

These chips from Motorola are so-called "terminal transmitters". They are used for digital data communication.

I found a very old paper from 1974 that refers to this chip. It is an interesting piece of history.
worldradiohistory.com/Archive-Electronic-Design/1974/Electronic-Design-V22-N15-1974-0719.pdf

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